Add travis configuration.

Change-Id: Iace1a1b21c4008fc29c5d886561cff189f0dd5e5
Address noa's comments.

* Build with java 6
* Remove explicit build dependency to libtcnative

Change-Id: Ie9430fe2282fac13d23118c50ad15a3676e8ce81
Merge pull request #1 from fpiccinini/travis-ci

Looks good. Merging.